Jordanian authorities detained four police officers Sunday on suspicion of using excessive force against protesters and journalists in a pro-democracy sit-in, a police spokesman said.
Police swinging clubs clashed Friday with dozens of demonstrators trying to set up an open-ended protest camp in a central square in Jordan's capital of Amman. At least 15 people were injured in the confrontation, which was the most violent since March.
About 100 journalists held a protest in Amman on Sunday to condemn the beatings.
Several photographers and journalists were among those hurt on Friday, raising accusations police targeted reporters to deter them from covering the protest.
Police spokesman Lt. Col. Mohamed al-Khatib said an investigation was under way to determine whether policemen broke the law. He said more officers could be arrested.